1) With the North’s hand, I would open 2♣. Note that the 2♣ opening is not always about the HCP, but it can also be the number of tricks we have in our hand. North’s hand is very powerful (3-4 losers), and after a 1♠ opening, it could well be possible that no one can bid, so I do not want to be passed out in 1♠.

2) Even after a 2♣ opening, it’s still very difficult to find a grand slam if the opponents continue to overcall 3♣ and raise to 4♣. Then again, it’s always difficult to bid a grand slam in any auction where both opponents have bid!
I would expect the auction to be something like:

2♣-(3♣)-Pass-(4♣)
4♠-(Pass)-5♣-(Pass)
5♦-(Pass)-5♠-(Pass)
6♣-(Pass)-?

It’s slightly pushy for South to have cuebid with 5♣, but the singleton club along with Qxx support is probably worth it. North then cuebids 5♦ and South bids 5♠. North might try for another push with a cuebid of 6♣, and now it might be possible for South to cuebid 6♥ to show third round control in hearts (since he didn’t cuebid 5♥ previously, he won’t have first or second round control in hearts), and now that might propel North to bid 7♠.

Like I said, it’s very easy when looking at both hands, but I would think getting to 6♠ would be a fantastic result especially when the opponents have bid. (Note that grand slam is decent, but it still requires a bit of luck in the heart suit.)

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